The purpose of this research was to study air cooling efficiency in vortex tube. For design, there were six heads to supply air to the system. The pipe size was calculated by thermodynamics relations and tested by comparing the length of the pipe 300, 450 and 600 mm to evaluate the temperature of outlet air and heat transfer, flow rate, outlet velocity and cooling efficiency in vortex tube respectively.The results showed that the aluminum tube, diameter 15 mm and length 300 mm, had the most efficiency and the best cooling. Furthermore, when the air pressure increased, the outlet temperature deceased while the efficiency increased. For uncontrolled environment temperature in the range 30-35 oC average cooling efficiency was 55.32%, outlet air temperature was 13.4 oC, flow rate was 6.5 m/s and other side temperature was 33.46 oC. For controlled surrounding temperature in the range 25 oC average cooling efficiency was 62.56 %, outlet air temperature was 9.73 oC, flow rate was 5.53 m / s and other side temperature was 25.66 oC.
Keywords: Efficiency, Air Cooling, Vortex Tube
